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Erich Hammerschmidt

Heinz U Blank

Horst Behre

Hans-Rudolf Dicke

Volker Eckhardt

Dieter Freitag

Ludwig Bottenbruch

Helmut Fiege

Stefan Antons

Frank Gerald Kleiner

Herbert Diehl

Guido Giffels

Georg Martin

Lutz Frohn

Dietmar Mayer

Adolf Winkler

Bruno Kruger

Otto Lindner

Heinz-Ulrich Blank

Heinz-Gerd Hartges

Piperidines are prepared in an advantageous manner by catalytic hydrogenation of activated pyridines in the presence of palladium catalysts if the palladium catalyst is palladium-on-carbon and the solvents are aromatic hydrocarbons.

Process for preparing piperidines

Process for the preparation of alkyl aryl ethers containing carboxyl groups which are suitable for the preparation of colour film couplers, or derivatives thereof, by reaction of aromatic alcohols with alkyl halides containing carboxyl groups or derivatives thereof and basic alkali metal or alkaline earth metal compounds, characterized in that the reaction is carried out in the melt of the aromatic alcohol.

Process for the preparation of alkyl aryl ethers containing carboxyl

The invention relates to the new compound 1-aminomethylnaphthalene-6-sulphonic acid, a process for its preparation by amidoalkylation of naphthalene-2-sulphonic acid and hydrolysis of the amidoalkylation product, and its use as an intermediate product for the preparation of 6-hydroxynaphthalene-1-carboxylic acid.

Process for the preparation of 6-hydroxynaphthalene-1-carboxylic from

Thermotropic, fully aromatic polyesters based on p-hydroxybenzoic acid, aromatic dicarboxylic acid and diphenol in which the dicarboxylic acid groups consist at least in part of 3,3'-diphenyldicarboxylic acid groups have excellent mechanical properties, in particular excellent elongation at break.

Thermotropic aromatic polymers with high elongation at break, processes

Thermotropic, fully-aromatic polyesters having a high content of 3,4'-benzophenonedicarboxylic acid radicals exhibit a combination, hitherto unknown, of good processability, high deflection temperature under load and very high strength and stiffness.

Thermotropic aromatic polyesters having a high deflection temperature

1-Aminomethylnaphthalene-6-sulphonic acid, its preparation and its use

Solid crystalline tetra-alkali metal salts of chromotropic acid, a process for their isolation and their use for the preparation of pure chromotropic acid or di-alkali metal salts of chromotropic acid.

Tetra-alkali metal salts of chromotropic acid, a process for their

The process for preparing 1-amino-2-naphthol-4-sulphonic acid by acidifying 3-oxo-4-hydroxyimino-1,2,3,4-tetrahydronaphthalene-1-sulphonic acid or its alkali metal salt in the presence of hydrogen sulphite is carried out in the presence of iron ions.

Process for preparing 1-amino-2-naphthol-4-sulphonic acid (amidol acid)

The invention relates to a process for the preparation of 1-benzoylamino-8-hydroxynaphthalene-4,6-disulphonic acid (benzoyl-K acid) by reacting 1-amino-8-hydroxynaphthalene-4,6-disulphonic acid (K acid) with benzoylating agents, according to which process mixtures of aminonaphtholdisulphonic acid isomers are used instead of pure K acid, which mixtures contain over 40% by weight of K acid, relative to the total amount of diazotizable compounds in the mixture of isomers, and in which no other single isomer has a proportion which exceeds 10% by weight of the total amount of diazotizable compounds in the mixture of isomers.

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Bergisch Gladbach, Germany

Erich Hammerschmidt